Numerical controller, machine tool, and control method for machine tool

Abstract

A numerical controller includes an extraction unit configured to extract at least one non-machining section from a tool path based on sensor information indicating a physical quantity detected by a sensor, a tool moving along the tool path, and the tool and a workpiece not coming into contact with each other in the non-machining section, a setting unit configured to set an end position of reverse movement in one non-machining section among the at least one non-machining section extracted by the extraction unit, the tool reversing along the tool path in the reverse movement, and a control unit configured to control the reverse movement.

The invention claimed is: 
     
       1. A numerical controller comprising:
 a processor configured to: 
 extract at least one non-machining section from a tool path based on sensor information indicating a physical quantity detected by a sensor, a tool moving along the tool path, and the tool and a workpiece not coming into contact with each other in the non-machining section; 
 set an end position of reverse movement in one non-machining section among the at least one non-machining section extracted by the extraction unit, the tool reversing along the tool path in the reverse movement; 
 control the reverse movement; and 
 receive information specifying the one non-machining section selected by a user among the at least one non-machining section, 
 wherein the processor sets the end position in the one non-machining section based on the received information. 
 
     
     
       2. The numerical controller according to  claim 1 , wherein:
 the end position is a position at a predetermined distance from a position where a machining section is switched to the non-machining section when the tool reversely moves; and 
 the processor further receives information indicating the predetermined distance. 
 
     
     
       3. The numerical controller according to  claim 1 , wherein:
 the processor further receives specification information indicating specifications of the tool; and 
 the end position is determined based on the specification information. 
 
     
     
       4. The numerical controller according to  claim 1 , wherein the at least one non-machining section includes a plurality of non-machining sections. 
     
     
       5. The numerical controller according to  claim 1 , wherein the sensor information is information indicating a load of a motor of a machine tool. 
     
     
       6. The numerical controller according to  claim 1 , wherein the processor extracts the non-machining section from a section of the tool path, the tool moving by cutting feed in the section. 
     
     
       7. A machine tool having the numerical controller according to  claim 1 . 
     
     
       8. A control method for a machine tool, the control method comprising:
 extracting at least one non-machining section from a tool path based on sensor information indicating a physical quantity detected by a sensor, a tool moving along the tool path, and the tool and a workpiece not coming into contact with each other in the non-machining section; 
 setting an end position of reverse movement in one non-machining section among the at least one extracted non-machining section, the tool reversing along the tool path in the reverse movement; 
 controlling the reverse movement; and 
 receiving information specifying the one non-machining section selected by a user among the at least one non-machining section, 
 wherein in the setting the end position is set in the one non-machining section based on the received information.